The first one is the radius of specified distance (km) that you can now add to each map marker. This feature offers better visibility of various activities around a particular marker, such as Foursquare checkins (or tweets), for example. And it’s the second new feature that gives you the possibility to display Foursquare checkins within this radius.
We’ve also improved the existing Twitter feature, which now provides better results when locating your Twitter friends and followers.